Ethylene glycol concentration

Figure 2.114 Plots of the intensities of (i) the 1410cm 1 band, (ii) the OH" feature near 1910cm 1, (iii) the 1310cm" oxalate band and (iv) the glycolate band near 1075cm"1, vs. potential observed in the FTIR experiments on the oxidation of ethylene glycol. Initial ethylene glycol concentrations were (a) 0.06 M, (b) 0.2 M,

Figure 7.6 Effect of ethylene glycol concentration on the crystalline melting temperature of PCTG copolyesters...

Ethylene Glycol Concentration by Volume Boiling Point ... 

For patients who have ingested more than 30 ml of (pure) methanol or ethylene glycol, dialysis is recommended, and haemodialysis is more effective than peritoneal dialysis. Dialysis both removes the alcohols and their metabolites, and corrects the renal and metabolic disturbances and so is the preferred treatment in severe poisoning. The maintenance dose of ethanol required may be tripled during haemodialysis as ethanol is also removed. Early treatment is indicated if ethylene glycol concentrations are above 20 mg/100 ml (200 mg/1), if the arterial pH is below 7.3, if serum bicarbonate concentrations are less than 20 mM/1, and when there are oxalate crystals in the urine. 

In a more recent study, Bello 857) has pointed out that this does not necessarily indicate denaturation in this solvent, and, in fact, that high degrees of order in both glycol and glycerol are maintained at least up to 90% polyol. The transition temperature is lowered so that in pure glycol it is near 25°. Under these conditions the protein can be expected to be very sensitive to other parameters such as the concentration of another solvent component. The acid transition 80S) is affected slightly or not at all by aqueous ethylene glycol concentrations up to 4 M, in marked contrast to dioxane, for example. 

Due to a cancellation of errors, the equation (without modification) is applicable for aqueous ethylene glycol concentrations to about 0.40 mole fraction (typically for system operation to 233 K). A comparison of results from Hammerschmidt s equation, as well as the prediction by the freezing point depression of water for methanol inhibition is summarized in Table 4.6. 

Hemorrhage in the globus paUidus occurred in a 50-year-old Afro-Caribbean alcoholic man after ethylene glycol poisoning there was evidence of lactic acidosis and the ethylene glycol concentration was 6.06 mmol/1 (31). 

Fraction III is diluted twice in buffer B containing 80% ethylene glycol to adjust the ethylene glycol concentration to 60%. Triton X-100 is added to 0.01% final concentration. This fraction is loaded on a (1.5 x 9 cm) heparin-Sepharose column equilibrated with buffer D (buffer C with 60% ethylene glycol and 0.01% Triton X-100). The column is washed with the same buffer until the eluate s protein concentration drops down to 20 p.g/ml. The column is then developed with a 150 ml linear gradient of 0.25 to 1 M NaCl in buffer D. The type II DNA topoisomerase active fractions are eluted between 0.3 and 0.7 Af NaCl. Fractions eluted between 0.3 and 0.4 M and between 0.4 and 0.7 Af are pooled and referred to as... 

Maddox et al. (1991) propose a technique for calculating the hydrate temperature of natural gas streams in the presence of hydrate inhibitors that gives results in excellent agreement with experimental data over a wide range of temperatures and concentrations. The experimental data available for comparison include temperatures from ambient to -l(X)°F, methanol concentrations from 20 to 85%, and ethylene glycol concentrations from 20 to 50%. 

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